fix issue215 - refactor test_python.py into multiple files:

- python/collect.py cotaining the core collection nodes
- python/fixture.py containing funcargs/fixture code
- python/metafunc.py generate_tests and metafunc usage
- python/raises.py the pytest.raises implementation

testing/python/raises.py

@@ -0,0 +1,64 @@
+import pytest
+
+class TestRaises:
+    def test_raises(self):
+        source = "int('qwe')"
+        excinfo = pytest.raises(ValueError, source)
+        code = excinfo.traceback[-1].frame.code
+        s = str(code.fullsource)
+        assert s == source
+
+    def test_raises_exec(self):
+        pytest.raises(ValueError, "a,x = []")
+
+    def test_raises_syntax_error(self):
+        pytest.raises(SyntaxError, "qwe qwe qwe")
+
+    def test_raises_function(self):
+        pytest.raises(ValueError, int, 'hello')
+
+    def test_raises_callable_no_exception(self):
+        class A:
+            def __call__(self):
+                pass
+        try:
+            pytest.raises(ValueError, A())
+        except pytest.raises.Exception:
+            pass
+
+    def test_raises_flip_builtin_AssertionError(self):
+        # we replace AssertionError on python level
+        # however c code might still raise the builtin one
+        from _pytest.assertion.util import BuiltinAssertionError
+        pytest.raises(AssertionError,"""
+            raise BuiltinAssertionError
+        """)
+
+    @pytest.mark.skipif('sys.version < "2.5"')
+    def test_raises_as_contextmanager(self, testdir):
+        testdir.makepyfile("""
+            from __future__ import with_statement
+            import py, pytest
+
+            def test_simple():
+                with pytest.raises(ZeroDivisionError) as excinfo:
+                    assert isinstance(excinfo, py.code.ExceptionInfo)
+                    1/0
+                print (excinfo)
+                assert excinfo.type == ZeroDivisionError
+
+            def test_noraise():
+                with pytest.raises(pytest.raises.Exception):
+                    with pytest.raises(ValueError):
+                           int()
+
+            def test_raise_wrong_exception_passes_by():
+                with pytest.raises(ZeroDivisionError):
+                    with pytest.raises(ValueError):
+                           1/0
+        """)
+        result = testdir.runpytest()
+        result.stdout.fnmatch_lines([
+            '*3 passed*',
+        ])
+